laying concrete over existing base.

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I've got an existing concrete base (approx 5" thick above ground), which at some time in the distant past has sunk towards one end by about 3". I want to erect a heavy duty wooden shed, so need to level up the base.
So I need to know
1. how do I prepare the existing surface?
2. What sort of thickness should I apply (bearing in mind the 3" level difference?
3. What sand/mixture should I use?

I realise that it would be best to completely relay the whole Base, but it is a large area, and I'm trying to avoid a lot of work if possible....
 
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